/*
 * Alloy Analyzer
 * Copyright (c) 2002 Massachusetts Institute of Technology
 *
 * The Alloy Analyzer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Alloy Analyzer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Alloy Analyzer; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package alloy.ast;

import java.util.Iterator;

public class Ids extends TreeNode {

    public Ids() {
	super(Location.UNKNOWN);
    }
    
    public Ids(Location location_) {
        super(location_);
    }
    /**
    public Ids(Id firstId_) {
	this(Location.UNKNOWN, firstId_);
    }

    public Ids(Location location_, Id firstId_) {
	this(location_);
	addId(firstId_);
    }
    **/

    /** add a {@link Id} to this */
    public void addId(Id id_) {
        addChild(id_);
    }

    /** get the ids of this */
    public Iterator getIdIter() {
        return getChildren();
    }

    /**
     * accept an AST visitor
     * @param visitor_ the visitor
     */
    protected void acceptVisitor(ASTVisitor visitor_) {
        visitor_.visit(this);
    }

    /**
     * accept a returning AST visitor
     * @param visitor_ the visitor
     * @return the Object returned by the visitor
     */
    protected Object acceptReturnVisitor(ASTReturnVisitor visitor_) {
        return visitor_.visit(this);
    }

    public boolean equals(Object obj) {
        if (obj instanceof Ids) {
            Ids other = (Ids)obj;
            if (other.numChildren() == numChildren()) {
                for (int i = 0; i < numChildren(); i++) {
                    if (!(childAt(i).equals(other.childAt(i)))) {
                        return false;
                    }
                }
                return true;                
            }
        }
        return false;
    }

    public int hashCode() {
        int ret = 0;
        for (int i = 0; i < numChildren(); i++) {
            ret += childAt(i).hashCode();
        }
        return ret;
    }
    
    public String toString()
    {
        return "Ids";
    }
}











